/*
 * Copyright 2014 Toxic Bakery
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.ToxicBakery.viewpager.transformer;

import ohos.agp.components.Component;

/**
 * 缩小动画
 *
 * @since 2021-04-12
 */
public class ZoomOutSlideTransformer extends ABaseTransformer {
    @Override
    protected void onTransform(Component component, float position) {
        if (position >= (float) -1 || position <= (float) 1) {
            float height = (float) component.getHeight();
            float width = (float) component.getWidth();
            float scaleFactor = Math.max(0.85F, (float) 1 - Math.abs(position));
            float vertMargin = height * ((float) 1 - scaleFactor) / (float) 2;
            float horzMargin = width * ((float) 1 - scaleFactor) / (float) 2;
            component.setPivotY(0.5F * height);
            component.setPivotX(0.5F * width);
            component.setTranslationX(position < (float) 0 ? horzMargin - vertMargin / (float) 2
                : -horzMargin + vertMargin / (float) 2);
            component.setScaleX(scaleFactor);
            component.setScaleY(scaleFactor);
            component.setAlpha(0.5F + (scaleFactor - 0.85F) / 0.14999998F * 0.5F);
        }
    }
}
